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Attempts at control focused first on the most visible contaminants (coal soot and fly ash) with the dangers of other components of smoke only gradually being recognized by activists and policy makers. The germ theory of illness had replaced miasmic explanations for disease, which meant that advocates for cleaner air found themselves describing problems that risked sounding more like inconveniences (e.g., the difficulty of drying laundry outdoors rather than the probability of dirty air leading to debilitating lung diseases such as pneumoconiosis).